What is the minimum population for the establishment of Family Court under the Family Courts Act, 1984?

Under Section 3(1)(a) of the Family Courts Act, 1984, the State Government, after consultation with the High Court, must establish a Family Court for every area comprising a city or town whose population "Exceeds 1 million". Under Section 3(1)(b) it may also set up Family Courts for other areas where it considers it necessary.